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This question is about paying for electricity. (a) Alice checks the information on her electricity bill. She also looks at information about some of her appliances. Appliance
Average power in kW
Time used per week in hours
cooker
2.0
6
immersion heater
3.0
12
central heating
6.0
18
Habib also looks at the information. He sees from the bill that the price of a unit of electricity is 20p. Using the immersion heater will cost twice as much a week as using the cooker.
Using the immersion heater will cost nearly ÂŁ5 more a week than using the cooker.
Alice
Habib
Complete calculations to show who is correct.
.......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... Who is correct? ........................................................................................................................... [3]
Š OCR 2015
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